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Electromagnetic ion-beam instabilities in a cold plasma

Published online by Cambridge University Press:  13 March 2009

G. Gnavi ,
L. Gomberoff ,
F. T. Gratton  and
R. M. O. Galvão
G. Gnavi
Affiliation:
Instituto de Física del Plasma, Consejo Nacional de Investigaciones Científicas y Técnicas, and Departmento de Física, Universidad de Buenos Aires, Faculated de Ciencias Exactas y Naturales, Ciudad Universitaria, Pab. 1, 1428, Buenos Aires, Argentina
L. Gomberoff
Affiliation:
Departamento de Física, Facultad cle Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
F. T. Gratton
Affiliation:
Instituto de Física del Plasma, Consejo Nacional de Investigaciones Científicas y Técnicas, and Departmento de Física, Universidad de Buenos Aires, Faculated de Ciencias Exactas y Naturales, Ciudad Universitaria, Pab. 1, 1428, Buenos Aires, Argentina
R. M. O. Galvão
Affiliation:
Instituto cle Física, Universidad cle São Paulo, CP 20516, São Paulo, Brasil
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Abstract

We study the stability of the cold-plasma dispersion relation for circularly polarized waves in a plasma composed of an ion background and an ion beam. The presence of the beam introduces a resonant branch into the dispersion relation for right-hand-polarized waves propagating in the direction of the external magnetic field, which, for V>Vφ, has negative energy (here V is the beam velocityVφ is the wave phase velocity). Therefore this branch may give rise to explosive instabilities when the waves experience parametric decays. It is shown graphically that resonant right-hand-polarized and non-resonant left-hand-polarized waves, propagating parallel to the external magnetic field, can be unstable. It is also shown that the instability region can extend to large frequencies and wavenumnbers, and that the instability regions have a band structure. The parametric dependence of instability thresholds and marginal modes is also studied.

Type
Research Article
Information
Journal of Plasma Physics , Volume 55 , Issue 1 , February 1996 , pp. 77 - 86
Copyright
Copyright © Cambridge University Press 1996

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